When doing lengthy math problems, you can save some time with a calculator. This wall clock, on the other hand, will make you 'solve' time - each hour is represented by a different mathematical equation! Quiz your friends by reading the time as "the square root of 64 hours and 198 divided by 66 minutes," instead of just "8:15." This clock's classic, chalkboard-black hue and white scribbles add character without subtracting functionality. If you're a math whiz, or just appreciate the nature of numbers, you'll get some good brain exercise out of this clock.